Aidan Gill's old-school salon was named best new barbershop last year, and he's become an oracle in one of America's fastest-growing industries. Tim Donnelly traces the cultural resurgence of barbershops from New Orleans to Brooklyn, New York.

With 9 million members in nearly 200 nations, Seattle-based LiveMocha is transforming language education. CEO Michael Schutzler explains how his business is capitalizing on the estimated $50 billion market.

What industries grew most in 2009? The list highlights medical technology, home health care, and self-improvement services. We also predicted a boom in yoga studios, and fast-casual dining-;before the food truck trend even took off.